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24. LED Display

Submitted by Testing on Mon, 09/07/2015 - 07:36

An LED-backlit LCD display is a flat panel display which uses LED backlighting instead of the cold cathode fluorescent (CCFL) backlighting used by most other LCDs. LED-backlit LCD TVs use the same TFT LCD (thin film transistor liquid crystal display) technologies as CCFL-backlit LCD TVs. Picture quality is primarily based on TFT LCD technology, independent of backlight type. While not an LED display, a television using this display is called an "LED TV" by some manufacturers and suppliers. Three types of LED are used:

  • Edge-lit LEDs This is the most common type in which the LEDs are formed around the rim of the screen, using a special diffusion panel to spread the light evenly behind the screen.
  • LED backlighting (Full array)- a multitude of small LEDs are placed behind the screen, whose brightness are not controlled individually.
  • Dynamic "local dimming" backlight have the same array of many LEDs, but are controlled individually (or in clusters) to control the level of light/color intensity in a given part of the screen.